How to Resolve MySQL\'s \'Incompatible with sql_mode=only_full_group_by\' Error in Laravel Eloquent?

Solving MySQL's 'Incompatible with sql_mode=only_full_group_by' Issue in Laravel Eloquent

A frequent issue encountered when using Laravel Eloquent for database operations is the MySQL error "Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column [...]." This error arises due to MySQL's strict mode known as only_full_group_by.

To exemplify the issue, consider the following Eloquent query:

$products = Product::where('status', 1)
            ->where('stock', '>', 0)
            ->where('category_id', '=', $category_id)
            ->groupBy('store_id')
            ->orderBy('updated_at', 'desc')
            ->take(4)
            ->get();

Executing this query may result in the aforementioned MySQL error. The reason for this is that MySQL's only_full_group_by mode requires that all columns in the SELECT list be either aggregated functions (e.g., COUNT, SUM) or included in the GROUP BY clause. However, in this query, the id column is not included in the GROUP BY clause but is present in the SELECT list.

To resolve this issue, one effective method is to disable MySQL's strict mode in the database connection settings:

'connections' => [
    'mysql' => [
        // Disabling strict mode for MySQL 5.6
        'strict' => false,
    ]
]

Alternatively, you can add the column to the GROUP BY clause:

$products = Product::where('status', 1)
            ->where('stock', '>', 0)
            ->where('category_id', '=', $category_id)
            ->groupBy('store_id', 'id')
            ->orderBy('updated_at', 'desc')
            ->take(4)
            ->get();

By relaxing the strict mode or adjusting the query to match MySQL's requirements, you can eliminate this error and retrieve your data successfully.

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